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Draw a box over the problem!!

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Step 1:This might not be your laptop it might give you a guide into the cmos battery The CMOS (Complementary Metal Oxide Semiconductor) battery saves basic settings on your computer. If the date and time function on your Acer notebook isn't working, chances are your CMOS battery needs to be replaced. Separate from your laptop's main battery, the CMOS battery is about the and shape of a coin and is located inside of your computer. Changing the battery yourself isn't the simplest task that relates to your Acer, but it isn't terribly difficult either. Here's how.

Open the notebook screen until you can easily access the keyboard. Locate the plastic bar that borders the top of the keyboard. Insert the flat head screwdriver at one end of the bar and gently pry it up until you can grip the edge with your fingers. Pry the other side of the bar up with the screwdriver and pull out the entire bar, being careful to mind the ribbon cord that connects the keyboard to the computer. Remove the two screws on either side of the keyboard that secure it to the computer. Slide the keyboard up and place it to the side. Remove the four screws on the exposed metal plate that covers the motherboard and remove it. You should now see the CMOS battery in the bottom-right-hand corner of the motherboard. Remove the battery by gently pulling it up and off the motherboard. Replace it with the same model battery (available at any computer store or online). Reassemble the computer the same way you took it apart. Acer TravelMate 6592G Keyboard Replacement Guide http://tomkaminski.com/acer-travelmate-6592g-keyboard-replacement-guidehttp://www.insidemylaptop.com/taking-apart-acer-aspire-5100-laptop/

You need to open your notebook remove first the battery and all screw at
the back of your notebook. You can see there a CMOS battery together
with the CMOS jamper. Just read it you can read CLRSCR which means clear
cmos, just pull it with in 10 seconds and insert it back. Now you are
done to reset bios.

There is every chance that the CMOS battery is dead and it needs replacing.

As far as i know you have to disassemble the laptop to get to the battery, I'm sure its next to the memory. The battery looks like this >>>>>>>

Here is complete guide to disassembling the notebook. Don't worry about references to other manufacturers or the title of the below link , just click on the link and follow the instructions till you can remove the battery and replace it. >>>>>>>>>>>>

The only way to reset the BIOS password is to
find the jumper pins on the motherboard and set them to the clear state
and remove the CMOS battery. It resets the CMOS to the default state.Your best bet is to contact tech support and explain the situation to them